Prevent Table Attachment with Active Replica to Avoid Error #60432

Why it matters

This feature addresses the problem of attaching a table in ClickHouse when an active replica already exists for the given replica path. It helps prevent errors and potential data inconsistencies by ensuring that users cannot attach a table that conflicts with an existing active replica.

How to use it

Users do not need to enable anything explicitly. When attempting to attach a table, ClickHouse will automatically check for the presence of an active replica on the same replica path and will reject the operation if such a replica exists.